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Performance Issue?
#216676 08/31/2008 10:08 AM
Joined: Jan 2004
Posts: 2,474
Likes: 3
D
driv
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Pooh-Bah
driv
Pooh-Bah
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Joined: Jan 2004
Posts: 2,474
Likes: 3
7.3.1

My site went down recently and I was corresponding with my hosts. These are the last two replies I got. It's all very amiable, but I wonder if someone can comment on these posts...

Quote
lrwxrwxrwx 1 root root 0 Aug 24 12:46 cwd ->
/nfs/mysite.com/forums
ls: cannot read symbolic link /proc/293/exe: No such file or directory
lrwxrwxrwx 1 root root 0 Aug 24 12:46 cwd ->
/nfs/mysite.com/forums
lrwxrwxrwx 1 root root 0 Aug 24 12:46 cwd ->
/nfs/mysite.com/forums
lrwxrwxrwx 1 root root 0 Aug 24 12:46 cwd ->
/nfs/mysite.com/forums
lrwxrwxrwx 1 root root 0 Aug 24 12:46 cwd ->
/nfs/mysite.com/forums
lrwxrwxrwx 1 root root 0 Aug 24 12:46 cwd ->
/nfs/mysite.com/forums
.
.
.
.
long list of identical entries
.
.
lrwxrwxrwx 1 root root 0 Aug 24 12:46 cwd ->
/nfs/mysite.com/forums
lrwxrwxrwx 1 root root 0 Aug 24 12:46 cwd ->
/nfs/mysite.com/forums



Quote
What was forwarded there shows that the cause for this mornings outage was the site with the most occupancy. While you may have not changed the site, use of, or abuse of the site caused the machine to take itself out of commission.

Please can you review your logs over this period and take steps to throttle or analyse the cause of stuck process/occupancy so we can work together on preventing such an occurrence in future.


Quote
I think that the issue we see is that the site is taking about 50% of
all traffic for that server cluster. Whenever the cluster load increases or the servers crash 50% of the time your site is the one that has created 250+ apache processes.

This isn't a 'new' issue or one that has developed recently, it's always been the case that any burst in traffic causes the servers to slow down and if it's a large enough flood of traffic, to crash. Usually it's a spider or search engine at fault but ultimately as things stand we're having to take emergency trouble tickets at all hours of the day and night to fix the servers and typically that means one of us being got out of bed at 3am to reboot one of the cluster boxes.

There are two options that we need to work towards considering. One is a dedicated server of your own to run the site from. The other is a
higher spec/lower density cluster.


Any thoughts?
Re: Performance Issue?
driv #216694 09/01/2008 2:15 PM
Joined: Jul 2006
Posts: 4,057
Liverpool : England : UK
Mark S Offline
Mark S
Offline
Joined: Jul 2006
Posts: 4,057
Liverpool : England : UK
Dedicated can be daunting if you never done it,
and in my case expensive, but a year in and i dont touch it
now it ticks along nicely smile

And its not as expensive as i thought.

I use a company called leaseweb in Netherlands
that sit on the easy net back bone to the UK and SKY smile


BOOM !! Version v7.6.1.1
People who inspire me Isaac ME Gizmo
Re: Performance Issue?
Mark S #216702 09/01/2008 2:57 PM
Joined: Jan 2004
Posts: 2,474
Likes: 3
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driv
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driv
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Good to see you back Mark smile

So I guess you can also also shove a couple of extra sites on the server being as you probably don't need the whole capacity for just one site?

...and that way I guess you can cut down on the other shared hosting costs?
Re: Performance Issue?
driv #216779 09/03/2008 6:54 PM
Joined: Jul 2006
Posts: 4,057
Liverpool : England : UK
Mark S Offline
Mark S
Offline
Joined: Jul 2006
Posts: 4,057
Liverpool : England : UK
Yeh but comes the hassel your supposed to know how to
fix the server if things go wrong.

But give it ago, we all started somewhere.

I went dedicated with the switch to Threads.
Been a journey, but happy with out restrictions.

BOOM !! Version v7.6.1.1
People who inspire me Isaac ME Gizmo

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